# -*-coding=utf-8 -*-
"""
    @author:sirius
    @time:2017.10.19
"""
# Python实现正态分布
# 绘制三维正态分布概率密度函数
import numpy

x = -4:0.3:4:y=x
[x,y] = meshgrid(x,y)
z=(1/2*pi)*exp((-1)*(x.^2/2+y.^2/2))
